FKIE_CVE-2026-34209

Vulnerability from fkie_nvd - Published: 2026-03-31 15:16 - Updated: 2026-04-03 15:59
Severity ?
7.5 (High) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
Summary
mppx is a TypeScript interface for machine payments protocol. Prior to version 0.4.11, the tempo/session cooperative close handler validated the close voucher amount using "<" instead of "<=" against the on-chain settled amount. An attacker could submit a close voucher exactly equal to the settled amount, which would be accepted without committing any new funds, effectively closing or griefing the channel for free. This issue has been patched in version 0.4.11.
References
security-advisories@github.comhttps://github.com/wevm/mppx/commit/94088246ee18f21b5d6be40d9e7a464f5a280bfbPatch
security-advisories@github.comhttps://github.com/wevm/mppx/releases/tag/mppx@0.4.11Release Notes
security-advisories@github.comhttps://github.com/wevm/mppx/security/advisories/GHSA-mv9j-8jvg-j8mrPatch, Vendor Advisory
Impacted products
Vendor Product Version
wevm mppx *
To clipboard 

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  "configurations": [
    {
      "nodes": [
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:wevm:mppx:*:*:*:*:*:node.js:*:*",
              "matchCriteriaId": "72D62258-34DE-453F-8DFC-D25FA285D537",
              "versionEndExcluding": "0.4.11",
              "vulnerable": true
            }
          ],
          "negate": false,
          "operator": "OR"
        }
      ]
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "mppx is a TypeScript interface for machine payments protocol. Prior to version 0.4.11, the tempo/session cooperative close handler validated the close voucher amount using \"\u003c\" instead of \"\u003c=\" against the on-chain settled amount. An attacker could submit a close voucher exactly equal to the settled amount, which would be accepted without committing any new funds, effectively closing or griefing the channel for free. This issue has been patched in version 0.4.11."
    }
  ],
  "id": "CVE-2026-34209",
  "lastModified": "2026-04-03T15:59:37.143",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "NONE",
          "baseScore": 7.5,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "NONE",
          "integrityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N",
          "version": "3.1"
        },
        "exploitabilityScore": 3.9,
        "impactScore": 3.6,
        "source": "security-advisories@github.com",
        "type": "Secondary"
      }
    ]
  },
  "published": "2026-03-31T15:16:18.030",
  "references": [
    {
      "source": "security-advisories@github.com",
      "tags": [
        "Patch"
      ],
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    },
    {
      "source": "security-advisories@github.com",
      "tags": [
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      ],
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    },
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    }
  ],
  "sourceIdentifier": "security-advisories@github.com",
  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-294"
        }
      ],
      "source": "security-advisories@github.com",
      "type": "Primary"
    }
  ]
}


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